NEF Compute Negative Eigen Fraction from PE dataset or mapping
[F,R] = NEF(W)
DescriptionThe negative eigenfraction is a ratio expressing the sum of magnitudes of all negative eigenvalues divided by the sum of magnitudes of all eigenvalues. The necessary numbers are stored in W = PE_EM(D) or in A = D*W, in which D is a symmetric dissimilarity matrix. The negative eigenratio is the ration of the magnitude of the lowest negative eigenvalue to the largest positive eigenvalue. See also
